optical and mid-infrared spectroscopy of mips sources in the ndwfs bootes field vandana desai
DESCRIPTION
Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai. T. Soifer, C. Bian, L. Armus, H. Teplitz (Pasadena) A. Dey, B. Jannuzi, E. Le Floc’h, K. Brand (Tucson) D. Weedman, S. Higdon, J. Higdon, J. Houck (Ithaca) IRS, IRAC, MIPS Instrument Teams. - PowerPoint PPT PresentationTRANSCRIPT
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T. Soifer, C. Bian, L. Armus, H. Teplitz (Pasadena)
A. Dey, B. Jannuzi, E. Le Floc’h, K. Brand (Tucson)
D. Weedman, S. Higdon, J. Higdon, J. Houck (Ithaca)
IRS, IRAC, MIPS Instrument Teams
Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field
Vandana Desai
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What is the role of infrared sources in galaxy evolution?
Wavelength (microns)
(nW
m-2 s
r-1)
Elbaz et al. 2002
Stars,AGN Dust
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IR galaxies are not significant today, but they were in the past
Papovich et al. 2004
Eu
clid
No
rm #
Co
un
ts
24 micron flux (mJy)
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4 deg
Optical Spectroscopic Survey
Area = 0.33 deg2
Flux limit = 0.3 mJy
Targeting completeness = 60% (548 targets)
Redshift completeness = 70%
NDWFS Bootes
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Space density as a function of LIR and redshift
Also see Le Floch et al. 2005,Perez-Gonzalez et al. 2005;Caputi et al. 2006
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What are the sources without redshifts?
Nu
mb
er
RedshiftLIRGs at
z = 1ULIRGs
at z > 1.5
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Nu
mb
erR
edsh
ift
R-[24] (mag)
Sources without redshfts
Sources with redshfts
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“Extreme” sources
€
R −[24] ≥14
fν (24)
fν (R)≥1000
νfν (24)
νfν (R)≥ 27
R-[24] color distribution for Bootes MIPS sources
R-[24] (Vega mag)
Fra
ctio
n
Most extreme
10%
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...where we find the peak of the 24m counts!
increasingly significant numbers at fainter fluxes... P
apovich et al. 2004≈0.3 mJy
Ext
rem
e F
ract
ion
24 micron flux (mJy)
24 micron flux (mJy)Eu
clid
No
rm #
Co
un
ts
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SEDs of Extreme Sources
Bump sources =
SF-dominated?
Zphot (bumps) =
1 - 2.5
De
y, De
sai et al. in pre
p
Bu
mp
Fra
ctio
n
24 micron flux (mJy)
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IRS results on extreme sources
1. IRS GTO Team: 58 sources with f(24) > 0.8 mJy
z~2; Few PAH-dominated sources
2. Yan et al. GO1: 52 sources with f(24) > 1 mJy AND R(24:8) > 0.5
z~2; 1/3 PAH-dominated sources
The brightest 24 micron sources tend to be AGN-dominated
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What about the PAH-rich sources at z~2?
f(24)=0.5-0.75 mJyULIRGs
Far-IR SED:70,160,350 micron observations pending
How well can we convert 24 micron flux to LIR at z=2?
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Lots more data on this active phase coming down the pipe!
• Lin Yan’s GO2 and GO3 IRS spectra– GO2: Flux-limited > 1 mJy– GO3: z=1 and z=2 faint samples
• Jiasheng Huang’s z=3 sample
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Le Floch et al. 2005
IR galaxies are not significant today, but they were in the past
Redshift
IR
(Lsu
n M
pc-3
)
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Redshift
R-[
24]
(Veg
a m
ag)
Are extreme sources are off the chart?